Martua Sitorus (born as Thio Seng Hap, 1960) is an Indonesian businessman and palm oil magnate.

[3] He and his business partner, Kuok Khoon Hong founded the Singapore-based Wilmar International, the largest palm oil producer in the world.

It has over 300 manufacturing plants and an extensive distribution network covering China, India, Indonesia, United States and some 50 other countries.

During his teenage years, Martua traded fish; when grown up he started his business as a palm oil and mesocarp trader.

[6] In 2014, Sitorus also formed a partnership with Roys Poyiadjis to create the largest biofuel power plant in Japan.